👉 Cals is a term that refers to calories. It's a measure of energy and can be converted into other units such as kilocalories, milliliters, or grams. In nutrition, it is used to describe the amount of food energy required for a given activity or metabolic state (e.g., weight loss, exercise). A cals value would indicate how many calories are needed per unit mass of food consumed. For example, if someone burns 400 calories in an activity,